Technical Paper Archive


This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.


For older papers not listed here, please send your request, including Meeting Year, Title, Author, and Paper # to: cbrady@rubber.org


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SERVICE LIFE DETERMINATION OF NITRILE O-RINGS IN HYDRAULIC FLUID

8

Event: 182nd Technical Meeting
Location: Cincinnati, OH
Date: October 09, 2012
Author: Richard J. Pazur, J .G. Cormier and K. Korhan-Tayma
Paper Number: 8

Price: $20.00

  • The service life of nitrile O-rings exposed to hydraulic fluid was determined by accelerated aging at nine temperatures and four immersion times. The aged O-rings were tested for hardness, volume swell, weight change, tensile mechanical properties (tensile strength, elongation and low strain modulus), compression set and chemical crosslink density by solvent swell. Using a 50% loss of tensile elongation as a failure criterium, an estimate of 15 years of service life at 230C was calculated. This corresponds to a compression set of 50% and an increase of approximately 30% of the chemical crosslink density. Calculated activation energies based on Arrhenius rate behaviour ranged from 50 to 65 kJmol'1, approximately 20-30 kJmol-l lower than nitrile rubber heat aged in air environments. The difference is attributed to additional crosslinking reactions occurring by lower energy pathways due in part, to the presence of hydraulic oils additives such as zinc dialkyldithiophosphates .
    By Richard J. Pazur, J .G. Cormier and K. Korhan-Taymaz

    Papers from 182nd Technical Meeting

    Items from 182nd Technical Meeting